Puzzle: Suppose four source species have the traits AB, DH, EF and CG, and the derived species have traits BEF, DEF, ADE, ACD, ACF, ADG, BEG and FGH.

• 进阶题：假设有四个根源物种，性状分别为AB,DH,EF,CG，八个衍生物种的性状为BEF,DEF,ADE,ACD,ACF,ADG,BEG与FGH。